Finding the Fourth Proportional to 2,112.80, 3,170.48 and 958.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,112.80 : 3,170.48 = 958.56 : x
2. Step 2: Convert to fraction form
   2,112.80/3,170.48 = 958.56/x
3. Step 3: Cross multiply
   2,112.80x = 3,170.48 × 958.56
4. Step 4: Simplify right side
   2,112.80x = 3,039,095.31
5. Step 5: Solve for x
   x = 3,039,095.31/2,112.80
6. Step 6: Final answer
   x = 1,438.42